水泥固化六价铬污染土力学性能及微观结构研究

doi:10.11934/j.issn.1673-4831.2018.10.012

Abstract

Abstract:

A series of electrical resistivity and unconfined compressive strength of hexavalent chromium polluted soil solidified with cement were measured, to reveal the influence of law of age, hexavalent chromium ion content and cement content on unconfined compressive strength and electrical resistivity of the hexavalent chromium polluted soil solidified with cement, and the relationship between the resistivity and unconfined compressive strength. The results show that, unconfined compressive strength and electrical resistivity of hexavalent chromium polluted soil solidified with cement increase with age, and the growth rate is different. The higher the chromium ion content, the lower the unconfined compressive strength and electrical resistivity of hexavalent chromium polluted soil solidified with cement. The more cement content, the greater the unconfined compressive strength of hexavalent chromium polluted soil solidified with cement. The unconfined compressive strength grows with age. When the curing time was shorter, the electrical resistivity of hexavalent chromium polluted soil solidified with cement increased slightly with the increase of cement content in the early age. Unconfined compressive strength(p_u) of samples with 10% cement is approximately linear with electrical resistivity(ρ) of:p_u=0.740 ρ+1.853,R²=0.917. The results of leaching experiments show that the leaching rate of metal decreased and the curing effect becomes better with the increase of curing agent content and curing age. Results of nuclear magnetic resonance revealed that the more hydration producs are embedded in the pore of soil with the increase of cement content, then the pore size range gets smaller. Based on analysis data in micro-pore structures, it shows that the overall smoothness and compactness of the specimens becomes better, and the strength increases with the increase of cement content.

Key words: hexavalent chromium, contaminated soil, electrical resistivity, unconfined compressive strength, leaching, magnetic resonance, microstructure

CLC Number:

XIONG Lu, SHEN Xiang-dong, XUE Hui-jun, LI Gen-feng, YUAN Qi, ZHOU Yu-xiao. Experimental Research of Mechanical Properties and Microstructure of Cement Solidified Hexavalent Chromium-Contaminated Soils[J]. Journal of Ecology and Rural Environment, 2018, 34(10): 946-954.

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Experimental Research of Mechanical Properties and Microstructure of Cement Solidified Hexavalent Chromium-Contaminated Soils

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